Continuing our series of tips for writing quickly.
Pick a good song that has the same tempo, length, and feel as the song you want to write. Then cut your example song into pieces, and replace each piece with an equivalent piece of your own creation. You'll end up with your own notes, lyrics, chords, and rhythms, in a song that's exactly the same shape as your example song.
How does the example song help if you write all new music and lyrics anyway? It helps by giving you a very precise to-do list, so none of your songwriting effort is wasted.